I need help on some motherboard information, etc.

Ok thanks through this forum I have learned alot of information on desktops, but other questions that I have remain. These are my questions, and all help will be greatly appreciated.

1. I would like to get a new pc case. I want to move all the parts in my current computer to a new pc case. I have looked at several cases and vendors, and I like the Thermaltake Tsunami at www.newegg.com. I also like the Thermaltake Shark www.compusa.com. My question is if I do move all my parts from my current computer to the Thermaltake Tsunami, will I have to do anything else? The BIOS tells me the amount of hard drive space my computer can handle, so If I get a new computer case that can handle more hard drives, will I have to update my bios or do anything else?

2. I want to get a new motherboard so I can upgrade to a new better processor/graphics card. I want a motherboard with a socket 939, and support for SLI. But I also want to move the parts on my current motherboard to a new motherboard (like my ethernet card, etc.) My question is if I do move my parts on my current motherboard to a new motherboard, will I have to do other steps also like update drivers or do something with software so that the new motherboard can recogize my parts?

3. I recently was looking for new motherboards (and still am). I saw alot of motherboards that have the same technology like a socket 939 and SLI support. I noticed that many of them have different prices, some more expensive than others. My question is do you get different performance benefits from more expensive motherboards? I mean like the more you spend on a motherboard, will you get better performance? because I thought all motherboards were the same and all have the same performance.

4. Can anyone give me the name of some good motherboards (I don't need the manufacturer), I want a motherboard that has 2x PCI express slots for SLI + plenty of pc slots for regular things such as an ethernet card, sound card( do sound cards take PCIe slots?). All the motherboards I have seen have 2 PCIe x16 slots but only have 3 pc slots. I would like a motherboard that has plenty of slots. can anyone help me here?

5. I always thought that PCIe slots were only x16, but I was reading someones post and he or she said that there were other types of PCIe slots(PCIe means PCI express) like x1 and x4. I know the x16 is used for the graphics card but what is x1 and x4 used for? Are they used for a T.V. tuner card or a sound card? because I always thought that a regular pc slot was used for a sound card and a tv tuner card. Maybe there was no regular pc slot, but then what atr those long while slots for?

Thanks for all the help, I greatly appreciate it.